Two forces act on a 55kg object. One force has magnitude 65 N directed 59° clockwise from the positive x-axis, and the other has a magnitude 35 N at 32° clockwise from the positive y-axis. What is the magnitude of this object's acceleration?
A) 1.5 m/s2 B) 1.7 m/s2 C) 1.1 m/s2 D) 1.3 m/s2
C
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A ball is tied to the end of an 80.0-cm string and swings in a vertical circle about a fixed center under the influence of gravity. The speed of the mass at the bottom of the swing is 6.00 m/s. Which of the following statements is true?
A) The ball does not have enough energy to reach the top of the circle. B) The ball has enough energy to reach the top of the circle but the string becomes slack before it can reach that point. C) The ball has enough energy to continue revolving in a complete vertical circle. D) This question cannot be answered without knowing the mass of the ball. E) This question cannot be answered without knowing the tension in the string.
For microbes to survive the journey in a meteorite from another solar system body to the Earth they would have to survive the
A) impact that blasted the rock off of the surface of its home world B) high energy particles and radiation in space C) entry through our atmosphere D) all of these
Which of the following are quanta of the electromagnetic field?
A) photons B) electrons C) Both of the above. D) quarks E) All of the above.
A 5.0-g lead bullet traveling in 19.0°C air at 300 m/s strikes a flat steel plate and stops. What is the final temperature of the lead bullet? (Assume the bullet retains all heat.) The melting point of lead is 327°C. The specific heat of lead is 0.128 J/g/°C. The heat of fusion of lead is 24.5 J/g
a. 278°C b. 186°C c. 445°C d. 327°C e. 371°C